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1999 GMC Safari Air conditioning

Tiny
STANSM
  • MEMBER
  • 1999 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
My air conditioning works good, except when I go up a long hill it shuts off. It comes on again when going back down hill. I check everywhere for a vacuum leak, as the controls are vacuum operated. The vac. Accumulator does not have a leak. My wife is driving me nuts because of this. Please help. Stan
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Sunday, July 27th, 2008 AT 12:51 AM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
The vacuum feed lines on those are famous for cracking, be sure that isnt thecase here. If all good, you can try a vacuum check valve to keep the engine from draining the vent system or even a small vacuum resevoir if you van doesnt have one
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Sunday, July 27th, 2008 AT 7:54 AM

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